Why isn't leaving cheating DP an easier decision?

Over the last 2 weeks my DP confessed that he has cheated on me with 3 women over the past 2-3 months (we've been together for 5 months, he moved in after a month). The first 2 were random women he met at a bar and it went as far as kissing/groping. The last one was with his ex who he got back in touch with about 3 months ago by email and then started meeting up with her, leading to sleeping with her. At first he admitted to just being in touch with his ex, about a week later in an argument he admitted hed slept with her, this weeks revelations have included the 2 random women and yesterday the fact that hed exchanged explicit emails with his ex, and taken photos of her.

Now Im not usually the type to be anyones doormat. I have always read the regular cheating/affair posts on here and recoiled with disgust, sure in my long-held (but never tested) opinion that I would never take a man back if I knew hed cheated on me (in any way, not just sex).

He says he detached himself from the reality of what he was doing, that he would never do this again  that he wont go out by himself, only when we could both go out together  and of course that he loves me and doesn't want to lose me.

Most days since finding this out, I felt a sick knot in my stomach throughout the day, and my emotions change by the hour from anger, to pain, to sadness to relief. I think part of me could actually ignore what happened and I have a strong desire to do that. How is this possible? Is this possible, is it healthy? Or will it come back to haunt me when I wake up? Why is it so hard for me to actually mean it when I say to him that this is over and I cannot forgive him, let alone trust and believe him?

Im not sure what I am looking for here, I havent told any of my friends/family because I feel like a stupid fool, so I cant talk to anyone in RL about this and I have no experience of infidelity. Perhaps I need to hear from others that I would be an idiot to consider staying in this relationship because from the inside my perspective feels utterly warped.

"Perhaps I need to hear from others that I would be an idiot to consider staying in this relationship because from the inside my perspective feels utterly warped."

You would be an idiot to consider staying in this relationship.

But you know that right? Like you know the two women he groped were probably more than two, and willing-to-bet-money more than groping? If he considers telling you, in 5 months that he has been unfaithful to you 3 times (that you know of) then just think of what he's not telling you.

I think the only thing that can be said is to use this as a warning to slow things right down in future, and to spend at least 6 months or more getting to know someone, seeing them with different people (work colleagues, friends, family), seeing them in different situations (stress, events, unexpected things) and just seeing how it plays out. You can't judge someone's character after a month.

As for what to do presumably as the house is yours, you ask him to move out! Surely he isn't expecting to stay after cheating 3 x in 5 months"

I know you are all right. I am saying the same things to myself, about everything. I just needed to see it in black and white, hear it from others. It is so awful that he could treat me with such disrespect on so many levels.

5 months is the blink of an eye. Cut him out and you will be over him in weeks. Don't cut him out and you are in for a lifetime of heartache. Just do it. You would be a real fool to carry on with this guy.

5 months is no time.I take it, I is your house/ flat?Just pack up his shit, and chuck him out. And if he doesn't return the key, change the locks.He's a vile disgusting creature, and is no doubt using you

If you've let a man move in with you and your children after a month, I'd have imagined that family and friends expressed concern. If that's the case, maybe what's holding you back from taking the most obvious sensible course of action is an unwillingness to prove them right. It's a very common dynamic that people stay in relationships for far too long because of feelings of 'us against the world'.

I'd advise ending the relationship but after that, spend a bit of time analysing what led you to making such a rash decision and then doubting yourself and even considering remaining in such a relationship.